The VoiceJam app for iPad was the centerpiece of my performance at TekServe a few months ago. They recently updated the app. The main new feature is a plug-in architecture and the first available plug-in the C1.
“The version adds In-App purchase of a VoiceTone C1 plug-in for adding the HardTune effects along with a long list of other features, improvements and fixes.” – tc-helicon.com
Download the App: itunes.apple.com/us/app/voicejam